CN115800721B - Method for eliminating grid-connected current harmonic distortion of three-phase grid-connected conversion circuit - Google Patents
Method for eliminating grid-connected current harmonic distortion of three-phase grid-connected conversion circuit Download PDFInfo
- Publication number
- CN115800721B CN115800721B CN202310075961.8A CN202310075961A CN115800721B CN 115800721 B CN115800721 B CN 115800721B CN 202310075961 A CN202310075961 A CN 202310075961A CN 115800721 B CN115800721 B CN 115800721B
- Authority
- CN
- China
- Prior art keywords
- grid
- current
- controller
- voltage
- harmonic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a method for eliminating grid-connected current harmonic distortion by a three-phase grid-connected conversion circuit, which comprises the following steps: the voltage loop controller is adopted to regulate the voltage of the direct current bus, and a low-pass filter is added in series behind the voltage loop controller and is used for filtering ripple components with 6 times of power frequency and higher frequency in the output value of the voltage loop controller, so that current harmonic distortion caused by power inversion is effectively inhibited; and a current loop feedback controller is adopted to regulate grid-connected current, and a selective harmonic repetitive controller is added in parallel in the current loop feedback controller and is used for accurately and rapidly tracking a reference signal and thoroughly eliminating 6k +/-1 th harmonic component in the grid-connected current, so that current harmonic distortion caused by grid voltage distortion and load disturbance is effectively inhibited. The invention can comprehensively and efficiently eliminate the grid-connected current harmonic distortion of the three-phase grid-connected converter caused by various factors.
Description
Technical Field
The invention belongs to the technical field of control of three-phase grid-connected conversion circuits, and particularly relates to a method for eliminating grid-connected current harmonic distortion of a three-phase grid-connected conversion circuit.
Background
With the high-speed development of power electronic technology, more and more power generation devices and power loads are connected into a power grid by adopting a power electronic converter as an interface, so that the harmonic pollution of the power grid is increased. For example, when the electric load adopts a three-phase diode or a thyristor bridge rectifier circuit as a grid-connected interface, a large amount of 6k + -1 harmonic current is generated and reactive power seriously pollutes the power grid, so that the electric power is polluted. Power electronics have become one of the most prominent sources of harmonics in the power grid. The standard of electric energy quality public power grid harmonic (GB/T14549-93) is issued in 1993 in China, the harmonic standard IEC555-2 is revised in 1988, and in addition, the IEC61000-3-2 standard is formulated, and the A-class standard requirement is shown in Table 1.
TABLE 1
The harmonic current and reactive current of the power system not only can increase the electric energy loss of lines and equipment and lead to the reduction of the power transmission and distribution efficiency of the power grid, but also can lead to a series of problems of electromechanical vibration, equipment overheat insulation aging, device misoperation, electromagnetic interference and the like, and the power supply quality of the power grid is reduced.
Compared with a three-phase diode or thyristor rectifying circuit, the three-phase Power Factor Correction (PFC) circuit or PWM rectifier and the like are adopted as grid connection interfaces of a power generation device or a power load, so that current harmonic pollution can be effectively reduced. The three-phase grid-connected conversion circuit comprises a three-phase PFC circuit, a three-phase PWM rectifier and the like, and is quite common in practical application and quite wide in application. Two main functions of the three-phase grid-connected conversion circuit include: (1) The alternating current grid-connected current is synchronous with the grid voltage and sinusoidal; (2) So that the voltage of the direct current side bus stably tracks a given reference value. The conventional control scheme of the three-phase grid-connected conversion circuit generally adopts a double-ring structure: the direct-current voltage control outer ring is mainly provided with a multi-purpose PI controller and is used for realizing the stable operation of the direct-current bus voltage at a set value; the alternating current grid-connected current control inner loop adopts a PID controller, a state feedback controller and the like for realizing accurate tracking of grid-connected current to reference current. For a three-phase grid-connected converter, as the AC/DC power conversion can cause 6 times of grid power frequency ripple of the DC bus voltage of the converter, the voltage ripple can cause 6 times of grid power frequency components in the output control quantity of the DC voltage outer ring controller, and then 6k+/-1 times of harmonic components appear in the grid-connected current reference quantity obtained by multiplying the output control quantity by the grid voltage detection value, so that 6k+/-1 times of harmonic distortion of the controlled grid-connected current is caused; secondly, the grid voltage is often polluted by 6k plus or minus 1 times harmonic to a certain extent, the grid-connected current cannot accurately track the sinusoidal signal by adopting a PID controller or a state feedback controller in a current loop, and particularly when the grid-connected current value is far lower than a rated value, the controller is often difficult to effectively inhibit external harmonic interference such as grid voltage distortion and the like, and serious harmonic distortion occurs. In summary, the three-phase grid-connected conversion circuit adopts a conventional control scheme, and the situation that the harmonic distortion of the grid-connected current exceeds the standard still often occurs.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method for eliminating harmonic distortion of grid-connected current by a three-phase grid-connected conversion circuit, which adopts a low-pass filter to eliminate 6 times of power frequency and higher frequency ripple in the output quantity of a direct current bus voltage controller used by a controller of the grid-connected conversion circuit, and inserts a parallel 6k+/-1 or 6k harmonic repetitive controller into a current loop controller of the converter aiming at 6k+/-1 harmonic distortion pollution in the three-phase grid-connected current, so that the combination of the three-phase grid-connected conversion circuit and the three-phase grid-connected voltage controller achieves the aim of quickly, accurately and thoroughly eliminating the harmonic distortion of the grid-connected current.
The technical scheme adopted by the invention is as follows: a method for eliminating grid-connected current harmonic distortion of a three-phase grid-connected conversion circuit comprises the following steps:
according to the deviation value of the given reference value and the detection feedback value of the DC bus voltage, a voltage loop controller is adopted to regulate the DC bus voltage;
removing ripple components with 6 times of power frequency and higher frequency in the output quantity of the voltage loop controller by adopting a low-pass filter;
multiplying the output value of the low-pass filter with the detection value of the grid voltage to obtain a reference value of the grid-connected current;
according to the deviation value of the reference value of the grid-connected current and the detection feedback value of the grid-connected current, a current loop controller is adopted to regulate the grid-connected current;
the selective harmonic repetitive controller is added into the current loop controller in parallel, so that stable non-difference tracking of the grid-connected current is realized in a targeted manner, 6k plus or minus 1 th harmonic components in the grid-connected current are effectively eliminated, and harmonic distortion of the grid-connected current is further reduced;
the current loop controller outputs a control signal to a control circuit of the PWM conversion circuit; the control circuit of the PWM conversion circuit outputs a PWM switching signal to the PWM conversion circuit based on the received control signal.
In the technical scheme, the low-pass filter is connected in series with the output end of the voltage loop controller, so that ripple components with 6 times of power frequency and higher frequency in the output of the direct-current bus voltage controller are removed.
In the technical scheme, the current loop controller under the abc static coordinate system is formed by connecting a feedback controller and a 6 k+/-1-order harmonic repetitive controller in parallel. The 6k plus or minus 1 order harmonic repetitive controller can realize steady state non-difference tracking reference current of grid-connected current, effectively inhibit external interference such as 6k plus or minus 1 order harmonic distortion of grid voltage and the like, and further reduce harmonic distortion of the grid-connected current.
In the technical scheme, the current loop controller under the synchronous rotation coordinate system is formed by connecting a feedback controller and a 6k harmonic repetition controller in parallel. The 6k harmonic repetition controller can realize steady-state non-difference tracking of the grid-connected current and effectively inhibit external interference such as 6k plus or minus 1 harmonic distortion of the power grid voltage, and further reduce harmonic distortion of the grid-connected current.
In the technical scheme, the cut-off frequency of the low-pass filter is higher than the bandwidth of the voltage loop controller by 2 times, but lower than the power frequency angular frequency of the power grid voltage by 3 times, so that the interference of the 6-time power frequency angular frequency ripple of the power grid voltage in the direct-current bus voltage feedback signal is effectively eliminated, and meanwhile, the dynamic response and the like of the existing control loop are not obviously influenced.
In the above technical scheme, the transfer function G of the 6k+ -1 th harmonic repetitive controller under the abc stationary coordinate system rc (s) is:
wherein k is rc To control gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage. The 6k plus or minus 1 order harmonic repetitive controller can realize steady state non-difference tracking reference current of grid-connected current, effectively inhibit external harmonic interference such as 6k plus or minus 1 order harmonic distortion of grid voltage and the like, and further reduce harmonic distortion of the grid-connected current. Compared with the conventional repetitive controller, the 6k plus or minus 1 harmonic repetitive controller occupies less memory and other computing resources, and the response speed for eliminating the 6k plus or minus 1 harmonic in the current can be improved to3 times.
In the above technical solution, the transfer function G of the 6 k-th harmonic repetitive controller in the synchronous rotation coordinate system rc (s) is:
wherein k is rc To control gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage. The 6k harmonic repetitive controller under the synchronous rotation coordinate system can realize steady state non-difference tracking reference current of grid-connected current, effectively inhibit external harmonic interference such as 6k plus or minus 1 harmonic distortion in grid voltage, and further reduce harmonic distortion of grid-connected current. Compared with the conventional repetitive controller, the 6k harmonic repetitive controller occupies less memory and other computing resources, and the response speed of eliminating 6k plus or minus 1 harmonic in current can be improved to 3 times.
The beneficial effects of the invention are as follows: the control strategy adopted by the invention consists of a direct current bus voltage feedback control loop and a grid-connected current feedback control loop, wherein a voltage loop controller is adopted to regulate the direct current bus voltage, so that the direct current bus voltage stably tracks a given reference value; and the current loop controller is adopted to regulate the grid-connected current, so that the grid-connected current accurately tracks the reference value of the grid-connected current, and the harmonic distortion of the grid current is effectively inhibited. According to the invention, a low-pass filter is added behind the direct-current bus voltage controller to eliminate ripple components with 6 times of power frequency and higher frequency, so that 6k+/-1 times of harmonic distortion of grid-connected current is reduced; according to the invention, the grid-connected current controllers under the abc static coordinate system are added with 6k plus or minus 1 harmonic repetitive controllers in parallel, or the grid-connected current controllers under the synchronous rotation coordinate system are added with 6k harmonic repetitive controllers in parallel, so that the steady-state non-difference tracking reference current of the grid-connected current is realized, external interference such as 6k plus or minus 1 harmonic distortion in the grid voltage is effectively inhibited, and the harmonic distortion of the grid-connected current is further reduced. Compared with the conventional repetitive controller, the 6k plus or minus 1 or 6k harmonic repetitive controller occupies less memory and other computing resources, and the response speed of eliminating the 6k plus or minus 1 harmonic in the current can be improved to 3 times.
Drawings
Fig. 1 shows a main circuit and a control circuit of a three-phase grid-connected inverter according to the present invention.
Fig. 2 is an embodiment three-phase Boost PFC main circuit and control circuit.
FIG. 3 shows three-phase grid-connected current i when a conventional PID double-loop control is adopted in a three-phase Boost PFC control circuit a ， i b ， i c And three-phase ac mains voltage v a ， v b ， v c Dc bus voltage v dc Is a simulation waveform of (a).
FIG. 4 shows the three-phase AC grid voltage v after adding a low-pass filter H(s) to a three-phase Boost PFC control circuit a ， v b ， v c And three-phase grid-connected current i a ， i b ， i c Dc bus voltage v dc And simulating waveforms.
FIG. 5 shows a three-phase Boost PFC control circuit with a low-pass filter H(s) and a current loop 6k+ -1 th harmonic repetitive controller G rc After(s), three-phase AC mains voltage v a ， v b ， v c And three-phase grid-connected current i a ， i b ， i c Dc bus voltage v dc And simulating waveforms.
Fig. 6 is a graph showing the comparison of the grid-connected current THD under three control modes of the conventional PI controller, the conventional controller+the low-pass filter H(s), and the conventional controller+the low-pass filter H(s) +the current repetitive controller.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in fig. 1, the invention provides a method for eliminating grid-connected current harmonic distortion by a three-phase grid-connected conversion circuit, which comprises the following steps:
according to the deviation value of the given reference value and the detection feedback value of the DC bus voltage, a voltage loop controller is adopted to regulate the DC bus voltage;
the output value of the voltage ring controller is multiplied by the detection value of the grid voltage to obtain the reference value of the grid-connected current after eliminating ripple components with 6 times of power frequency and higher frequency in the ring output quantity of the voltage controller through a low-pass filter;
according to the deviation value of the reference value of the grid-connected current and the detection feedback value of the grid-connected current, a current loop controller is adopted to regulate the grid-connected current, and a harmonic repetitive controller is added in parallel by the feedback controller to realize steady-state non-difference tracking of the grid-connected current, so that external harmonic interference such as grid voltage distortion and the like is effectively inhibited, 6k plus or minus 1 times of harmonic components in the grid-connected current are thoroughly eliminated, and harmonic distortion of the grid-connected current is further reduced;
the current loop controller outputs a control signal to a control circuit of the PWM conversion circuit; the control circuit of the PWM conversion circuit outputs a PWM switching signal to the PWM conversion circuit based on the received control signal.
Specifically, the collected value of the grid voltage is processed by a phase-locked loop and then used as the detection value of the grid voltage.
The output end of the voltage ring controller is connected with a low-pass filter H(s) in series, and the output value of the direct current bus voltage ring controller is subjected to low-pass filtering treatment so as to eliminate 6 times of power frequency components in the ring output quantity of the voltage controller. In particular, the cut-off frequency of the low-pass filter H(s) is higher than 2 times the conventional control voltage loop bandwidth, but lower than 3w 0 Wherein w is 0 The power frequency angle frequency of the power grid voltage is used for effectively eliminating the interference of the 6 times power frequency angle frequency ripple wave of the power grid voltage in the feedback signal of the direct current bus voltage, and meanwhile, the dynamic response and the like of the existing control loop are not obviously affected.
Specifically, the current loop controller under the abc static coordinate system is formed by connecting a feedback controller and a 6 k+/-1-order harmonic repetitive controller in parallel.
Transfer function G of the 6k + -1 th harmonic repetitive controller rc (s) is:
wherein k is rc To control gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage.
Specifically, the current loop controller in the synchronous rotation coordinate system is formed by connecting a feedback controller and a 6 k-th harmonic repetitive controller in parallel.
Transfer function G of the 6 k-th harmonic repetition controller rc (s) is:
wherein k is rc To control gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage.
The present embodiment takes a conventional three-phase Boost PFC circuit as an example, wherein the three-phase grid voltage v a ，v b ，v c Is 50Hz, 220V (effective value) and contains 5 th harmonic components of 250Hz, 11V and 7 th harmonic components of 350 Hz, 6V. The control system of the three-phase Boost PFC circuit is characterized in that the voltage v of a direct-current bus is used for controlling the voltage v of the direct-current bus dc Voltage control outer loop and three-phase grid-connected current i a ，i b ，i c Is formed by a current control inner ring. The voltage control outer ring adopts a PI controller, and the current control inner ring adopts a PID controller. Reference value i of current control inner loop ref From mains voltage v a ，v b ，v c The detection value of (2) is processed by a phase-locked loop and then is matched with the output value u of a voltage loop PI controller v Multiplication.
As shown in FIG. 3, if the grid-connected current i of the three-phase Boost PFC circuit adopting the conventional feedback control scheme a ，i b ，i c The more serious harmonic distortion still occurs, and the total harmonic distortion of grid-connected current is as high as 6.22%. The main reasons for this include: on the one hand, the DC bus voltage v of the converter can be caused by AC/DC power conversion dc The detection value contains ripple component of 6 times of power frequency of the power grid, thereby causing direct currentOutput control value u of voltage outer loop PI controller v The output value of the voltage loop PI controller and the power grid voltage v are caused by the fact that the voltage loop PI controller contains 6 times of power grid power frequency components ac Grid-connected current reference value i obtained by multiplying power frequency fundamental wave components a * ，i b * ，i c * Harmonic components of 5 times and 7 times, thus leading to harmonic distortion of 5 times and 7 times of grid-connected current; on the other hand, the grid voltage v a ，v b ，v c The grid-connected current loop PID controller generally cannot enable grid-connected current to accurately track sinusoidal signals, external harmonic interference such as grid voltage distortion is difficult to restrain, and particularly when the grid-connected current value is far lower than a rated value, grid-connected current harmonic distortion is aggravated.
Aiming at the grid-connected current harmonic distortion problem, as shown in fig. 2, the conventional control scheme is improved as follows in the specific embodiment:
(1) For 6 times of power frequency ripple wave component contained in the direct current bus voltage, a low-pass filter H(s) is connected in series behind a direct current bus voltage loop controller, so that a grid-connected current reference value i is avoided a * ，i b * ，i c * And 5 th and 7 th and higher harmonic components. The cut-off frequency of the low-pass filter H(s) is higher than 2 times the conventional control voltage loop bandwidth but lower than 3w 0 Wherein w is 0 The power frequency angle frequency of the power grid voltage is used for effectively eliminating the interference of the 6 times power frequency angle frequency ripple wave of the power grid voltage in the feedback signal of the direct current bus voltage, and meanwhile, the dynamic response and the like of the existing control loop are not obviously affected.
As shown in fig. 4, after the low pass filter H(s) is added, the harmonic distortion of the grid-connected current is reduced from 6.22% to 5.0%.
To realize grid-connected current i a ，i b ，i c Steady state non-difference tracking its reference value i a * ，i b * ，i c * Adding parallel selective harmonic repetition controller G on conventional PID feedback controller rc (s) forming a composite controller for implementing andthe grid current steady state zero difference tracking reference current pointedly thoroughly eliminates the influence of 6k plus or minus 1 harmonic error and grid voltage harmonic disturbance in grid-connected current signals, and further reduces harmonic distortion of the grid-connected current.
In the ABC static coordinate system, a 6k + -1 order harmonic repetitive controller is adopted, and the transfer function is that
Under the synchronous rotation coordinate system, a 6 k+/-1-order harmonic repetitive controller is adopted, and the transfer function is as follows:
wherein the gain k is controlled rc E (0, 2), phase compensator G f (z) taking the system, Q(s) is a low-pass filter, T 0 Is the fundamental period of the grid voltage.
As shown in FIGS. 5 and 6, a 6k + -1 order harmonic repetitive controller G is further added rc After(s), grid-connected current harmonic distortion is finally reduced from 5% to 0.77%.
In conclusion, the control strategy of the invention can improve the system power factor and reduce the total harmonic distortion of grid-connected current. Compared with the conventional repetitive controller, the 6k + -1 or 6k harmonic repetitive controller occupies less memory and other computing resources, and the response speed of eliminating 6k + -1 times of the current can be improved to 3 times.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (4)
1. A method for eliminating grid-connected current harmonic distortion by a three-phase grid-connected conversion circuit is characterized by comprising the following steps of: the method comprises the following steps:
according to the deviation value of the given reference value and the detection feedback value of the DC bus voltage, a voltage loop controller is adopted to regulate the DC bus voltage;
eliminating ripple components with 6 times of power frequency and higher frequency in the loop output quantity of the voltage controller by adopting a low-pass filter;
multiplying the output value of the low-pass filter with the detection value of the grid voltage to obtain a reference value of the grid-connected current;
according to the deviation value of the reference value of the grid-connected current and the detection feedback value of the grid-connected current, a current loop controller is adopted to regulate the grid-connected current;
adding the selective harmonic repetitive controller into the current loop controller in parallel, tracking a reference signal and thoroughly eliminating 6k +/-1 th harmonic component in the grid-connected current;
the current loop controller outputs a control signal to a control circuit of the PWM conversion circuit; the control circuit of the PWM conversion circuit outputs PWM switching signals to the PWM conversion circuit based on the received control signals;
the current loop controller under the abc static coordinate system is formed by connecting a feedback controller and a 6 k+/-1-order harmonic repetitive controller in parallel;
the current loop controller under the synchronous rotation coordinate system is formed by connecting a feedback controller and a 6 k-th harmonic repetitive controller in parallel.
2. The method for eliminating harmonic distortion of grid-connected current by using the three-phase grid-connected conversion circuit according to claim 1, wherein the method comprises the following steps of: the cut-off frequency of the low-pass filter is higher than 2 times of the bandwidth of the voltage loop controller, but lower than 3 times of the power frequency angular frequency of the power grid voltage.
3. The method for eliminating harmonic distortion of grid-connected current by using the three-phase grid-connected conversion circuit according to claim 1, wherein the method comprises the following steps of: transfer function G of 6k + -1 th harmonic repetitive controller under abc static coordinate system re (s) is:
wherein k is rc To control gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage.
4. The method for eliminating harmonic distortion of grid-connected current by using the three-phase grid-connected conversion circuit according to claim 1, wherein the method comprises the following steps of: transfer function G of 6 k-th harmonic repetitive controller under synchronous rotation coordinate system re (s) is:
wherein k is rc To control gain, G f (s) is the transfer function of the phase compensator, Q(s) is the transfer function of the low pass filter, T 0 Is the fundamental period of the grid-connected voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310075961.8A CN115800721B (en) | 2023-02-07 | 2023-02-07 | Method for eliminating grid-connected current harmonic distortion of three-phase grid-connected conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310075961.8A CN115800721B (en) | 2023-02-07 | 2023-02-07 | Method for eliminating grid-connected current harmonic distortion of three-phase grid-connected conversion circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115800721A CN115800721A (en) | 2023-03-14 |
| CN115800721B true CN115800721B (en) | 2023-05-26 |
Family
ID=85430318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310075961.8A Active CN115800721B (en) | 2023-02-07 | 2023-02-07 | Method for eliminating grid-connected current harmonic distortion of three-phase grid-connected conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115800721B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3062431B1 (en) * | 2015-02-27 | 2021-05-05 | Delta Electronics (Thailand) Public Co., Ltd. | Pfc current shaping |
| CN109861563A (en) * | 2019-03-19 | 2019-06-07 | 南京工程学院 | PWM rectifier control method based on bearing power feedforward and Repetitive controller |
| CN111142389A (en) * | 2020-01-19 | 2020-05-12 | 江南大学 | Customized harmonic wave repetitive controller and control method |
-
2023
- 2023-02-07 CN CN202310075961.8A patent/CN115800721B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115800721A (en) | 2023-03-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111416382B (en) | Control method of two-stage three-phase cascade photovoltaic grid-connected inverter | |
| WO2024093334A1 (en) | Control method, new energy converter, and grid-connected power system | |
| Yang et al. | Modeling and control of single-phase AC/DC converters | |
| CN115800722B (en) | Method for eliminating grid-connected current harmonic distortion of single-phase grid-connected conversion circuit | |
| Tarasantisuk et al. | Active and reactive power control for three-phase grid inverters with proportional resonant control strategies | |
| Costa et al. | New hybrid high-power rectifier with reduced THDI and voltage-sag ride-through capability using boost converter | |
| CN100364199C (en) | Single-phase active electric-power filter using analog cascade connection controller | |
| Zhang et al. | A novel tri-state boost PFC converter with fast dynamic performance | |
| Antar et al. | Using seven-level cascade H-bridge inverter with HVDC system to improve power quality | |
| CN115800721B (en) | Method for eliminating grid-connected current harmonic distortion of three-phase grid-connected conversion circuit | |
| CN116846202A (en) | Negative sequence current suppression system and method based on network construction type converter | |
| Chen et al. | Design and implementation of DSP-based voltage frequency conversion system | |
| Subbarao et al. | Digital fuzzy current mode controlled integrated PFC converter with external ramp compensation | |
| Xiao et al. | Sliding mode SVM-DPC for grid-side converter of D-PMSG under asymmetrical faults | |
| CN114094847A (en) | Method for optimizing VIENNA rectifier input current under wide-range unbalanced power grid | |
| CN113872209A (en) | Single-phase photovoltaic grid-connected control method for eliminating direct-current bus voltage sampling ripple | |
| CN113206504A (en) | Power supply network voltage comprehensive compensation control method based on chain type power electronic converter | |
| Zhao et al. | Improved cascade-type repetitive control of grid-tied inverter with LCL filter | |
| CN103812107B (en) | A kind of Mixed cascading seven level active filter based on complex controll | |
| Gaiceanu | AC-AC Converter system for AC drives | |
| Wu et al. | Boost PFC converter with a new sinusoidal reference current algorithm | |
| Chen et al. | Research on fast transient and 6n±1 harmonics compensating repetitive control scheme for three-phase systems | |
| Babaei et al. | Development of pulse width modulation technique for controlling inverters under balanced and unbalanced operations | |
| Liu et al. | A Harmonic Suppression Method of H6 Topology Single Phase Inverter | |
| Fang et al. | A novel One-cycle control strategy for three-phase power converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |